Polly.JS - Record, Replay, and Stub HTTP Interactions

Polly.JS is a standalone, framework-agnostic JavaScript library that enables recording, replaying, and stubbing of HTTP interactions. By tapping into multiple request APIs across both Node & the browser, Polly.JS is able to mock requests and responses with little to no configuration while giving you the ability to take full control of each request with a simple, powerful, and intuitive API.

It helps to record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests. You can use Polly's client-side server to modify or intercept requests and responses to simulate different application states (e.g. loading, error, etc.).